I just got some moose tines from Moscow Hide and Fur to use as horn tips. They are kinda small, looks like I will have to go with a 1/2" tenon and hole for an applied tip.
Crazy Crow and Powder Horns and More sell horn rolls, but the price is getting up there. The good news is you can get two tips out of one roll. TELL THEM YOU DON'T WANT ANY BLEMISHES IN THE HORN, IT CAN RUIN A LOT OF GOOD WORK.
John (Bigsmoke)